|Table of Contents|

Research on active control of deformation of existing tunnel caused by foundation pit excavation(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2024年04期
Page:
130-138
Research Field:
桥隧工程
Publishing date:

Info

Title:
Research on active control of deformation of existing tunnel caused by foundation pit excavation
Author(s):
SU Dong1; 2;  ZHANG Xiaomei3;  ZHANG Guotao1; 2;  LEI Guoping4;  CHEN Xiangsheng1; 2
(1. Key Laboratory of Coastal Urban Resilient Infrastructure of Ministry of Education, Shenzhen University, Shenzhen 518060, Guangdong, China; 2. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China; 3. Shenzhen Qianhai Construction Investment Holding Group Co., Ltd., Shenzhen 518066, Guangdong, China; 4. College of Civil Engineering and Transportation, Foshan University, Foshan 528225, Guangdong, China)
Keywords:
foundation pit;  tunnel displacement;  supporting axial force;  active control system
PACS:
TU472
DOI:
10.19815/j.jace.2022.08053
Abstract:
Finite element analysis method was used to study a new type of active control system for the axial forces of the supports, and a design method was proposed. The influence of excavation of a foundation pit in granite residual soil layers on existing tunnels was studied without applying active axial force to the supports. The excavation impact zone of the foundation pit was divided based on the displacement of tunnels at different positions on the side of the foundation pit under the action of excavation. Based on the proposed axial force design method, a study was conducted on the influence of active control of axial forces of the supports on the displacement of existing tunnels during excavation of the foundation pit. The critical control ratio of tunnel displacement control below the warning value of 10 mm was obtained, and its distribution pattern at different tunnel positions was analyzed. The results show that the scope of the impact zone in this stratum is relatively small compared to the existing research results. The tunnel displacement is approximately proportional to the control ratio of the diaphragm wall displacement. The horizontal displacement of the tunnel near the excavation depth of 0.6 times depth of the foundation pit needs to be strictly controlled. The critical control ratio obtained through horizontal displacement control is smaller in areas close to the foundation pit and deeper, and tunnel horizontal displacement control should be the main approach. The area far from the foundation pit and shallow in depth should be mainly controlled by vertical displacement of the tunnel. The quantitative research results on the excavation impact zone of foundation pits in residual granite soil and the critical control ratio can provide reference for similar projects.

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Last Update: 2024-07-20